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<?php
/**
* Nextcloud - user_sql
*
* @copyright 2018 Marcin Łojewski <dev@mlojewski.me>
* @author Marcin Łojewski <dev@mlojewski.me>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
namespace OCA\UserSQL\Crypto;
use OCP\IL10N;
/**
* phpass hash implementation.
*
* @author Marcin Łojewski <dev@mlojewski.me>
*/
class Phpass extends AbstractAlgorithm
{
const ITOA64 = './0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz';
private $iterationCount;
/**
* The class constructor.
*
* @param IL10N $localization The localization service.
* @param int $iterationCount Iteration count (log2).
* This value must be between 4 and 31.
*/
public function __construct(IL10N $localization, $iterationCount = 8)
{
parent::__construct($localization);
$this->iterationCount = $iterationCount;
}
/**
* @inheritdoc
*/
public function checkPassword($password, $dbHash, $salt = null)
{
return hash_equals($dbHash, $this->crypt($password, $dbHash));
}
/**
* @param string $password Password to encrypt.
* @param string $setting Hash settings.
*
* @return string|null Generated hash. Null on invalid settings.
*/
protected function crypt($password, $setting)
{
$countLog2 = strpos(self::ITOA64, $setting[3]);
if ($countLog2 < 7 || $countLog2 > 30) {
return null;
}
$count = 1 << $countLog2;
$salt = substr($setting, 4, 8);
if (strlen($salt) !== 8) {
return null;
}
$hash = $this->hash($salt . $password);
do {
$hash = $this->hash($hash . $password);
} while (--$count);
$output = substr($setting, 0, 12);
$output .= $this->encode64($hash, strlen($hash));
return $output;
}
/**
* Apply hash function to input.
*
* @param string $input Input string.
*
* @return string Hashed input.
*/
protected function hash($input)
{
return md5($input, true);
}
/**
* Encode binary input to base64 string.
*
* @param string $input Binary data.
* @param int $count Data size.
*
* @return string Base64 encoded data.
*/
private function encode64($input, $count)
{
$output = '';
$i = 0;
do {
$value = ord($input[$i++]);
$output .= self::ITOA64[$value & 0x3f];
if ($i < $count) {
$value |= ord($input[$i]) << 8;
}
$output .= self::ITOA64[($value >> 6) & 0x3f];
if ($i++ >= $count) {
break;
}
if ($i < $count) {
$value |= ord($input[$i]) << 16;
}
$output .= self::ITOA64[($value >> 12) & 0x3f];
if ($i++ >= $count) {
break;
}
$output .= self::ITOA64[($value >> 18) & 0x3f];
} while ($i < $count);
return $output;
}
/**
* @inheritdoc
*/
public function getPasswordHash($password, $salt = null)
{
return $this->crypt($password, $this->genSalt());
}
/**
* Generate salt for the hash.
*
* @return string Salt string.
*/
private function genSalt()
{
$output = '$P$';
$output .= self::ITOA64[min($this->iterationCount + 5, 30)];
$output .= $this->encode64(random_bytes(6), 6);
return $output;
}
/**
* @inheritdoc
*/
protected function getAlgorithmName()
{
return "Portable PHP password";
}
}
|
